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We present Linkage Query Writer (LinQuer), a system for
generating SQL queries for semantic link discovery over re-
lational data. The LinQuer framework consists of (a) LinQL,
a language for specification of linkage requirements; (b) a
web interface and an API for translating LinQL queries to
standard SQL queries; (c) an interface that assists users in
writing LinQL queries. We discuss the challenges involved in
the design and implementation of a declarative and easy to
use framework for discovering links between different data
items in a single data source or across different data sources.
We demonstrate different steps of the linkage requirements
specification and discovery process in several real world sce-
narios and show how the LinQuer system can be used to
create high-quality linked data sources.